The expression levels of ZmNPR1 mimicked that of ZmPR-1 for the non-treated control and inoculated treatments at all time-points in B73 (Fig. 2C), showing significant suppression in the wounded and inoculated treatments compared to the non-treated control from 0 to 3 DAI. Inoculation did not cause any significant variation in ZmNPR1 expression compared to the wounding treatment in B73 until 18 DAI where there was a similar increase in expression as observed for ZmPR-1. Again, no control samples were available for comparison at the 18 DAI time point for ZmNPR1. However, in TZAR101 (Fig. 2D), ZmNPR1 expression was induced at later time points by inoculation compared to wounding or non-treated controls, a pattern which is different from that observed for ZmPR-1. The expression of ZmNPR1 in response to inoculation was significantly higher than the non-treated control in TZAR101 from 4 to 10 DAI and significantly higher than the wounded
treatment beginning at 6 DAI. Expression of ZmNPR1 in the wounded treatment was also suppressed at 14 and 18 DAI in
comparison to the non-treated control. Overall, the expression levels of ZmNPR1 remained elevated in TZAR101 over the duration of the time course, in comparison to those observed in B73 (p ¼ 0.0051; Table S9).